Controlling device



April 2, 1940. J. 1.. HULSHIZER 2,195,488

CONTROLLING DEVICE Filed July gs, 193a I I I I I VENTOR' 5; HQ 1 giiziiaif HIS ATTORNEY Patented Apr. 2, 1940 PATENT. OFFICE CONTROLLINGDEVICE Joseph I. Hul shizer, Stewartsville, N. J., assignor toIngersoll-Rand Company, Jersey City, N. J., a corporation of New Jersey-Application July 28, 1938, Serial No. 221,748 1.

1 Claim.

This invention relates to controlling devices, and .more particularly toa controlling device applicable to the feeding mechanism of a fluidactuated rockdrill of the stoper type.

,One object-of the invention is to assure large flow area. through arotary control valve of small Figure l is an elevation, partly insection, of v a stopertype rock drill equipped with a controlling deviceconstructed in accordance with the practice of the invention,

Figure 2 is an enlarged View, partly broken away, of the controllingdevice, and Figures 3 and 4 are transverse viewsv taken through Figure 2on the lines 3-3 and 4-4,

respectively.

Referring more particularly to the drawing,

20 designates a rock drilling mechanism, to which the invention isapplied, and comprises a percussive element 2| indicated by the externalcasing parts consisting of the cylinder 22, the front head 23 and theback head 24. A hood 25 is arranged at the front end of the front headand a chuck 26 extends through the hood to accommodate a Workingimplement 21 which the rock drill is intended to actuate.

The rock drill is provided with a suitable feeding device 28 shown, byway of example, as comprising a pair of cylinders 29 arranged onopposite sides of the cylinder 22. The cylinders 29 extend through theback head and with their front ends into a flange 30 on the front head23 to which they are secured by nuts 3| threaded on extensions 32carried by the cylinders. On

the rearward ends of the cylinders 29 are heads 33 which may be threadedto the cylinders 29 to form closures therefor and act against spacers 34seating against the back head 24 to clamp the back head to the end ofthe cylinder 22.

Within the cylinders 29 are pistons 35 having rods 36 that extendslidably through the heads 33 and are connected to a cross head 31carrying a rock engaging pointer 38 upon which the drilling mechanismrests during drilling. The pointer, in effect, serves as a pivot for thedrilling mechanism which may be conveniently rotated about its axis orheld against rotational movement by a handle 39 clamped to one of thefeeding cylinders 29 by a bolt 40.

The pressure fluid employed for actuating the drilling mechanism isconveyed thereto by a conduit 4| connected. to a valve casing 42 on thecylinder 22. The casing 42 contains a throttle valve 43 having a chamber44 into which pressure fluid flows fromthe conduit 4| throughapassage 545in the valve casing. 42; y

The throttle valve 43 controls the supply of pressure fluid to both thepercussive andfeed ing elements. It is accordingly provided with a pairof ports 46 and 41 of which the former communicates the chamber 44 witha supply passage 48 leading to the distributing valve mechanism (notshown) of the rock drill, and

the port 46 affords communication between the chamber 44 and a passage49 in the cylinder 22 andthe front head 23 and having branches 5!] thatopen into the forward ends of the. feeding cylinders 29. v

The ports 46 and 41 'may be brought simultaneously into registry withthe adjacent passages to which they are intended to supply. pressurefluid. Thus, when the throttle valve is rotated to a position to supplypressure fluid to the percussive element pressure fluid will. besimultaneously supplied to the front ends of the feeding cylinders 23for raising the percussive. 'element toward the work.' The ports 46 and41' may, however, be so positioned that pressure fluid. will first beintroduced into thelfeeding cylinders to raisethe drill before thepercussive element is setinoperation.

In" drilling mechanisms equipped with a plurality of feedingcylinders,it is desirable that a single element be provided for controlling thepressure values in all the feeding cylinders. It is, moreover, essentialthat such element be located within convenient reach of the operator andthat, when located on the surface of the drilling mechanism, it be ofcompact form in ing mechanism that might strike against the rock surfaceand become damaged. Thus, when applied, say, to a drilling mechanism ofthe character described the controlling device, desigsay, the portionsof the passage 49 lying 'for- 5 order to prevent high protuberances onthe drill-. 40

wardly and rearwardly of the bore 53 open into opposite sides of thebore, although in different transverse planes.

Within the bore 53 is a cylindrical rotary valve 5% having a lever 55,whereby thevalve may be manipulated, seating against an end of the valvecasing 52, and the valve carries a pin 56 that lies in a slot 5? in theend of the valve casing 52 and seats against the ends of the slot 5'! tolimit the degree in which the valve may be rotated in the bore 53.

Extending through the valve 54 is a passage 58 to afford communicationbetween the branches of the passage l9 and said passage 58 arrangedangularly With respect to the valve. By arranging the passages 49 and inthe manner described the ends of the passage 58 will also lie indifferent transverse planes. Thus, when the valve 54 lies in the closedposition to cut off the flow of pressure fluid through the passage 49the ends of thepassage 58 will be sealed by portions of the bore 53lying in different transverse planes and will, therefore, be adequatelysealed even though the diameter of the passage 58 is large as comparedwith the diameter of the valve In the periphery of the valve, 54 is apartly annular groove 59 which lies in the same transverse plane as theentrance end of the portion of the passage 19 lying forwardly of thebore 53 and affords communication between said portion ofthe passage 49and an exhaust casing 52.

Preferably, means are provided to normally maintain the valve in aposition in which the pasport 60 in the sage 58 will be in registry withthe passage 49 and to return the valve to this position when released inthe closed position. To this end a coil spring 53 is disposed about thevalve stem 52 and anchored thereto at one end. The other end of thespring 5!. is anchored to a casing 53 having a lug fi l that seats intoa depression 55 on the end of the valve casing 52 to prevent relativerotary movement between the casings.

The casing 63 encircles the spring 5! and has an internal shoulder 56that seats upon a flange 6? of a spacer 58 disposed about the stem 62.The outer end of the spacer 68 serves as a seat for a washer 69 which inturn forms a seat for a nut threaded on the-outer end of the valve stem.62. The inner end of the spacer 68 abuts a shoulder H at the junctureof the valve 54 and the stem 52. The shoulder ii is so positioned thatit lies'immediately exteriorly of the casing 52 in order that a slightclearance may exist between the spacer and the end of the valve casing.The spacer 58 and the washer 69 thus serve to prevent the application ofa binding pressure on the valve 54, and the spacer and the lever 55 willcooperate with the ends of the valve casing 52 to prevent endwisemovement of the valve 54.

In practice the present invention has been found to be highly desirablefor use in controlling passages of sizable flow area and in which thespace available for the control member or valve is limited. By soarranging the passage 58 in the valve that its ends lie in differenttransverse planes a comparatively large passage 58 may be provided andwhen the valve is rotated to the closed position sufficient surface willliebetween theends of the passage 58 and the passages in the casing topreclude the unauthorized flow of pressure fluid to the element intendedto be controlled, in the present instance the cylinders 29.

In the operation of the device, and as has been previously stated, thevalve 54 will normally occupy a position in which the passage 58 is inregistry with the passage so that when the throttle valve 43 is moved toposition to establish registry of the port 46 with the passage 49pressure fluid will at once be admitted into the feeding cylinder 29without requiring the additional manipulation of the valve 54. Thepercussive element will then immediately be actuated toward the work,and in the event that it be desired to decrease the pressure value inthe cylinders 29 the valve 54 isrotated to move the passage 58 out ofregistry with the passage 19 and to bring the groove 59 into registrywith the portion of the passage 49 lying forwardly of the valve 54. Aportion of the pressure fluid will then pass from the cylinders 29through the passage 49 to v the groove 59 and the port til to theatmosphere.

After the need of low pressure in the cylinders 29 has passed the leveris released and the spring 69 will then rotate the valve 54 to positionto establish full communication between the pressure fluid supply andthe feeding cylinders.

I claim:

- A controlling device, comprising a casing having a cylindrical boreand coaxially aligned passages opening into the opposite sides-of thebore and at different points along the length of the bore, a cylindricalrotary valve in the bore having a passage to establish communicationbetween the first said passages, an exhaust port in the casing leadingfrom the bore, a channel in the valve to afford communication betweenone of the first said passages and the exhaust port, means on the valvecooperating with the casing to prevent endwise movement of the valve inone direction, a shoulder on the valve lying exteriorly of the casing, aspacer on the valve seating against the shoulder and cooperating withthe casing to prevent endwise movementof the valve in an oppositedirection, means for clamping the spacer against the shoulder, and aspring attached to the casing and the valve for returning said valve toand holding it in a limiting position.

JOSEPH I. HULSHIZER.

